Organic matter content in riparian areas of soil composed of woody vegetation and grass and its effects on pesticide adsorption

Abstract

Purpose Riparian zones are identified as mitigation areas of agricultural pollutants to river ecosystems. However, the mitigation mechanisms of these pollutants remain unclear mainly on the effects of different types of riparian vegetation and its organic matter content in the pollutants removal process. This study aims to assess the content of organic matter in soils composed of woody vegetation and grass and its effects on four pesticides adsorption. Adsorption studies were conducted in soil collected in riparian vegetation areas composed of grass and trees under the influence of an agricultural area. Methods The analyses were performed in 21 shakers containing 100 g soil and a L of water previously contaminated with pesticide that were stirred for 30, 60, 120, 240, 360, 720, and 1440 min. A study was made of maximum adsorption capacity using the time 360 min and the concentrations of 5, 20, 40, and 50 μg L −1. Results The soils of woody vegetation areas had a higher concentration of organic matter as compared with grass areas, and time 360 min achieved the highest adsorption capacity with minimum values of 84% adsorption for the area of land made up of trees and 67% for grass areas. The soils of woody vegetation areas had a higher concentration of organic matter as compared with grass areas, time 360 min. Conclusion The best adsorption capacity was obtained with minimal adsorption amounts of 84% to the area of soil composed of 67% for trees and grass areas.

Soil Amended With Organic Matter Increases Fluvial Erosion Resistance of Cohesive Streambank Soil

“…Fresh plant material (i.e., surface residue, sloughed roots, or root exudates) are known to initiate aggregate development by forming the center of new aggregates through the production of microbially-derived substances like EPS (Six et al, 2004). Prior studies have measured significantly higher total SOC content in woody plant-dominated riparian areas/upland environments compared to areas dominated by herbaceous vegetation (de Rebello et al, 2019;Paul et al, 2008). However, higher root densities in grass-dominated environments may lead to greater fractions of SOC quality that are directly associated with initial aggregate formation/stabilization (Paul et al, 2008).…”

Improvement of Soil Pore Distribution and Soil Moisture Content using Organic Matter Addition Technology

“…Organic matter is an essential factor in soil fertility. The decomposition process that occurs makes nutrients available for plants (de Rebello et al, 2019). The soil organic matter values in the third month decreased for all treatments.…”

Adsorption Characteristics of Oxytetracycline by Different Fractions of the Organic Matter from Humus Soil: Insight from Internal Structure and Composition

“…The influences of organic matter have been extensively reported during the adsorption/desorption process of antibiotics in soil. Many have found that there is a simple positive relationship between the content of soil organic matter and adsorption capacity [20,21]. However, Pils et al [22] found that some soil organic matter could cover up adsorption points, leading to reduce the absorption of antibiotics in the soil.…”